Ratio & Proportion Calculator
Solve ratios and proportions easily. Find missing values in proportional relationships.
Proportion: a/b = c/d
=
Results
Value of d
8
Simplified Ratio (a:b)
3:4
a/b as Decimal
0.7500
a/b as Percent
75.00%
Proportion Formula
Cross Multiplication
If a/b = c/d, then a × d = b × c
Solving for Each Variable
- • a = (b × c) / d
- • b = (a × d) / c
- • c = (a × d) / b
- • d = (b × c) / a
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Handbook of Mathematical Functions
by Abramowitz & Stegun
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.